<p>The accurate prediction of cutting force during the milling of thin-walled parts plays an important role in adjusting process parameters and controlling machining quality. However, the uncertainty of elastic deformation and its dynamic response during the machining of thin-walled parts makes the accurate prediction of cutting force influenced by elastic deformation a significant challenge. To address this issue, this paper proposes a prediction model for cutting force that considers the influence of elastic deformation, aiming to accurately predict the cutting force influenced by elastic deformation. The model introduces a dynamic modification coefficient (DMC) to quantify the uncertainty of elastic deformation. The calculation of the DMC is based on the non-linear fitting of the equivalent rigidity of the thin-walled parts, which achieves efficient calculation of the DMC. Simultaneously, the model also considers the coupled iteration of cutting force, deformation, and chip thickness, enabling accurate prediction of cutting force in actual machining through theoretical process parameters. Finally, the proposed prediction model is evaluated using experimental data. The evaluation results indicate that the proposed prediction model exhibits excellent prediction accuracy, can predict the dynamic characteristic of the cutting force, and provides data support for the analysis of elastic deformation.</p>